/**
	This file is part of Fighting Field.

    Fighting Field is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Fighting Field is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Fighting Field.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef FF_SLIDER_H
#define FF_SLIDER_H

#include "Prerequisites.h"

#include "Widget.h"

namespace Ogre
{
	class BorderPanelOverlayElement;
	class PanelOverlayElement;
}

namespace FF
{
	class Slider : public Widget
	{
	public:
		struct Style
		{
			Ogre::String templateName;
		};
		
	public:
		// Do not instantiate any widgets directly. Use GuiManager.
		Slider(const Ogre::String& name, const Style& style, const Ogre::DisplayString& caption, Ogre::Real width, Ogre::Real trackWidth,
			Ogre::Real valueBoxWidth, Ogre::Real minValue, Ogre::Real maxValue, unsigned int snaps);

		// Sets the minimum value, maximum value, and the number of snapping points.
		void SetRange(Ogre::Real minValue, Ogre::Real maxValue, unsigned int snaps, bool notifyListener = true);

		const Ogre::DisplayString& GetValueCaption();
		// You can use this method to manually format how the value is displayed.
		void SetValueCaption(const Ogre::DisplayString& caption);
		
		const Style& GetStyle() const { return mStyle; }

		void SetValue(Ogre::Real value, bool notifyListener = true);
		Ogre::Real GetValue();

		const Ogre::DisplayString& GetCaption();
		void SetCaption(const Ogre::DisplayString& caption);

		void _OnCursorPressed(const Ogre::Vector2& cursorPos);
		void _OnCursorReleased(const Ogre::Vector2& cursorPos);
		void _OnCursorMoved(const Ogre::Vector2& cursorPos);
		void _OnFocusLost();

	protected:
		// Internal method - given a percentage (from left to right), gets the
		// value of the nearest marker.
		Ogre::Real GetSnappedValue(Ogre::Real percentage);

	protected:
		Style mStyle;
		Ogre::TextAreaOverlayElement* mTextArea;
		Ogre::TextAreaOverlayElement* mValueTextArea;
		Ogre::BorderPanelOverlayElement* mTrack;
		Ogre::PanelOverlayElement* mHandle;
		bool mDragging;
		bool mFitToContents;
		Ogre::Real mDragOffset;
		Ogre::Real mValue;
		Ogre::Real mMinValue;
		Ogre::Real mMaxValue;
		Ogre::Real mInterval;
	};
}

#endif